EP 0514816 A1 19921125 - Dynamic lead screw engagement and indicator.
Title (en)
Dynamic lead screw engagement and indicator.
Title (de)
Dynamische Einrückung für Verschiebungsspindel mit Einrastanzeige.
Title (fr)
Engagement dynamique d'un vis-ecrou avec détection d'engagement.
Publication
Application
Priority
US 70433791 A 19910523
Abstract (en)
Automatic engagement of a lead screw (42) with a lead screw drive mechanism (44). A plunger driver (20) used to move the plunger (24) of a syringe (18) is connected to the screw drive mechanism. A first detector (38) provides a plunger signal indicating the presence of a syringe plunger in the plunger driver and a second detector (60) provides a thread engagement signal indicating engagement or disengagement of the lead screw drive mechanism with the lead screw. The thread engagement detector monitors movement of a rigid linkage at the screw drive mechanism which has a nonlinear characteristic curve. In the case where the plunger signal indicates the presence of a plunger and the thread engagement signal indicates engagement of the drive mechanism with the lead screw, the lead screw is rotated in a forward direction to remove the thread clearance. In the case where the thread engagement signal indicates disengagement of the drive mechanism with the lead screw, the processor rotates the lead screw first in a reverse direction and then in a forward direction to cause engagement of the threads. <IMAGE> <IMAGE>
IPC 1-7
IPC 8 full level
A61M 5/145 (2006.01); F16H 25/20 (2006.01)
CPC (source: EP US)
A61M 5/1456 (2013.01 - EP US); F16H 25/2025 (2013.01 - EP US); A61M 2005/14573 (2013.01 - EP US); Y10S 128/01 (2013.01 - EP US)
Citation (search report)
- [A] EP 0314880 A2 19890510 - BRAUN MELSUNGEN AG [DE]
- [A] WO 8201998 A1 19820624 - IVAC CORP [US]
- [A] US 4189950 A 19800226 - KILLIAN HENRY R [US]
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
US 5106375 A 19920421; DE 69215270 D1 19970102; DE 69215270 T2 19970522; EP 0514816 A1 19921125; EP 0514816 B1 19961120
DOCDB simple family (application)
US 70433791 A 19910523; DE 69215270 T 19920518; EP 92108366 A 19920518